By using the test kit I was able to pick the right spined arrow for a new high performance longbow I'd recently purchased without having to buy several dozen arrows to test. In less than an hour I had a bare shaft shooting dead-on at thirty yards and with the FOC design was able to go from five inch fletching to three inch. Also with the FOC design I can tell a difference in the arrow impacting the target harder. Can't wait to see what it does on flesh and bone. My only complaint with the Hammerhead is the finish. My new bow incorporates a plunger button and the shaft makes noise when drawn against it unlike other arrows I've tried, but this is a minor problem considering all the pluses.

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